Hello. I am a Malaysian passport holder. I have a trip from Detroit to Singapore, and I need to transit at Pudong: DTW-PVG-SIN.

1. Do I need a transit visa when I transit at PVG (transit time between the flights is around 5 hours)?
2. Do I have to reclaim my baggage and check-in again when I transit at PVG?
3. Are Delta Airlines and China Eastern located in the same terminal?
4. Do I need to pass through the passport control/immigration when I transit at PVG?

Additonal Info:
DTW-PVG (using Delta Airlines) and PVG-SIN (using China Eastern)

Thank you!